Masatou Ishihara

Controlled n-type doping in graphene using a photobase generator and polyethylene oxide blends

Yuqing Wang, Masatou Ishihara, Kazuhiro Kirihara, Lixian Jiang et autres

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Transparent Patternable Large-Area Graphene p–n Junctions by Photoinduced Electron Doping

Kazuhiro Kirihara, Yuki Okigawa, Masatou Ishihara, Masataka Hasegawa et autres

We present a novel approach to achieve n-type doping in graphene and create graphene p–n junctions through a photoinduced electron doping method using photobase generators (PBGs). The unique properties of PBGs allow us to spatially and temporally control the doping process via …

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Impedance Characteristics of Monolayer and Bilayer Graphene Films with Biofilm Formation and Growth

Ryoichi Nakagawa, Kai Saito, Hideyuki Kanematsu, Hidekazu Miura et autres

Biofilms are the result of bacterial activity. When the number of bacteria (attached to materials' surfaces) reaches a certain threshold value, then the bacteria simultaneously excrete organic polymers (EPS: extracellular polymeric substances). These sticky polymers encase and protect the bacteria. They are …

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Formation of monolayer MoS2 p–n junctions by spatially selective Nb doping during chemical vapor deposition

Mitsuhiro Okada, Toshifumi Irisawa, Naoka Nagamura, Naoya Okada et autres

One-step chemical vapor deposition of 3D-NbS2/2D-MoS2 metal/semiconductor junctions

Mitsuhiro Okada, Naoya Okada, Wen-Hsin Chang, Toshitaka Kubo et autres

3D-2D metal-semiconductor junctions composed of bulk NbS 2 and monolayer MoS 2 have been obtained from the one-step chemical vapor deposition method. The results of Raman and atomic force microscopy confirmed that the outer and the inner regions of the crystal are …

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Impedance Characteristics of Biofilms Formed on Graphene Films and Their Substrates

Hideyuki Kanematsu, Ryoichi Nakagawa, Yuki Torisawa, Hidekazu Miura et autres

Biofilms are inhomogeneous film-like matters formed on materials by bacterial activities. They bring about many detrimental problems in various fields such as cooling pipes, kitchens, toilets, baths, marine structures, food industries, medical applications, hospitals etc., as well as beneficial purposes. Therefore, they …

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Gas-source chemical vapor deposition growth of micrometer-scale tungsten disulfide atomic layers under alkali-metal free condition

Mitsuhiro Okada, Naoya Okada, Wen-Hsin Chang, Tetsuo Shimizu et autres

Micrometer-scale WS 2 atomic layers grown by alkali metal free gas-source chemical vapor deposition with H 2 S and WF 6 precursors

Mitsuhiro Okada, Naoya Okada, Wen-Hsin Chang, Tetsuo Shimizu et autres

Abstract Scalable chemical vapor deposition (CVD) of two-dimensional semiconducting materials such as MoS 2 and WS 2 is a key technology for the application of these materials in real devices. In this work, we demonstrate the growth behavior of WS 2 crystals …

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Proliferation of mesenchymal stem cells by graphene-attached soft material structure

Masahito Ban, Ryouta Shimoda, Yuki Okigawa, Masatou Ishihara

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Thermoelectric and Electrical Properties of Metal Intercalated Bilayer Graphene

Jumpei Kihara, Yuki Okigawa, Masatou Ishihara, Setsuko Koura

1 Introduction There are many heats that are being thrown away around us. About 42% of Japan's exhaust heat is below 200 ℃, and recovery of these low-temperature exhaust heat is hardly progressing. This is because the places where low-temperature exhaust heat …

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Micrometer-Scale Monolayer WS2 Crystal Grown by Alkali Metal Free Gas Source Chemical Vapor Deposition with H2S and WF6 Precursors

Mitsuhiro Okada, Naoya Okada, Wen-Hsin Chang, Tetsuo Shimizu et autres

2020 International Conference on Solid State Devices and Materials ,Micrometer-Scale Monolayer WS2 Crystal Grown by Alkali Metal Free Gas Source Chemical Vapor Deposition with H2S and WF6 Precursors

Thermoelectric and Electrical Properties of Metal Intercalated Bilayer Graphene

Jumpei Kihara, Yuki Okigawa, Masatou Ishihara, Setsuko Koura

Most thermoelectric materials that convert waste heat into electric power are inorganic materials, which poses problems in terms of flexibility and environmental load. Graphene is a carbon material with a two-dimensional structure and is expected to be a new thermoelectric material because …